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Auto merge of #43055 - est31:stabilize_float_bits_conv, r=sfackler 

Stabilize float_bits_conv for Rust 1.21

Stabilizes the `float_bits_conv` lib feature for the 1.20 release of Rust. I've initially implemented the feature in #39271 and later made PR #43025 to output quiet NaNs even on platforms with different encodings, which seems to have been the only unresolved issue of the API.

Due to PR #43025 being only applied to master this stabilisation can't happen for Rust 1.19 through the usual "stabilisation on beta" system that is being done for library APIs.

r? @BurntSushi

closes #40470.
This commit is contained in:
bors 2017-07-17 00:19:43 +00:00
parent 8f1339af2e 010dea13ee
commit 56071f6879
3 changed files with 4 additions and 9 deletions
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6
src/libstd/f32.rs
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@ -1090,12 +1090,11 @@ impl f32 {
/// # Examples
///
/// ```
/// #![feature(float_bits_conv)]
/// assert_ne!((1f32).to_bits(), 1f32 as u32); // to_bits() is not casting!
/// assert_eq!((12.5f32).to_bits(), 0x41480000);
///
/// ```
#[unstable(feature = "float_bits_conv", reason = "recently added", issue = "40470")]
#[stable(feature = "float_bits_conv", since = "1.21.0")]
#[inline]
pub fn to_bits(self) -> u32 {
unsafe { ::mem::transmute(self) }
@ -1118,7 +1117,6 @@ impl f32 {
/// # Examples
///
/// ```
/// #![feature(float_bits_conv)]
/// use std::f32;
/// let v = f32::from_bits(0x41480000);
/// let difference = (v - 12.5).abs();
@ -1127,7 +1125,7 @@ impl f32 {
/// let snan = 0x7F800001;
/// assert_ne!(f32::from_bits(snan).to_bits(), snan);
/// ```
#[unstable(feature = "float_bits_conv", reason = "recently added", issue = "40470")]
#[stable(feature = "float_bits_conv", since = "1.21.0")]
#[inline]
pub fn from_bits(mut v: u32) -> Self {
const EXP_MASK: u32 = 0x7F800000;

6
src/libstd/f64.rs
View File

@ -1005,12 +1005,11 @@ impl f64 {
/// # Examples
///
/// ```
/// #![feature(float_bits_conv)]
/// assert!((1f64).to_bits() != 1f64 as u64); // to_bits() is not casting!
/// assert_eq!((12.5f64).to_bits(), 0x4029000000000000);
///
/// ```
#[unstable(feature = "float_bits_conv", reason = "recently added", issue = "40470")]
#[stable(feature = "float_bits_conv", since = "1.21.0")]
#[inline]
pub fn to_bits(self) -> u64 {
unsafe { ::mem::transmute(self) }
@ -1033,7 +1032,6 @@ impl f64 {
/// # Examples
///
/// ```
/// #![feature(float_bits_conv)]
/// use std::f64;
/// let v = f64::from_bits(0x4029000000000000);
/// let difference = (v - 12.5).abs();
@ -1042,7 +1040,7 @@ impl f64 {
/// let snan = 0x7FF0000000000001;
/// assert_ne!(f64::from_bits(snan).to_bits(), snan);
/// ```
#[unstable(feature = "float_bits_conv", reason = "recently added", issue = "40470")]
#[stable(feature = "float_bits_conv", since = "1.21.0")]
#[inline]
pub fn from_bits(mut v: u64) -> Self {
const EXP_MASK: u64 = 0x7FF0000000000000;

1
src/libstd/lib.rs
View File

@ -317,7 +317,6 @@
#![feature(unwind_attributes)]
#![feature(vec_push_all)]
#![cfg_attr(test, feature(update_panic_count))]
#![cfg_attr(test, feature(float_bits_conv))]
#![cfg_attr(not(stage0), default_lib_allocator)]
#![cfg_attr(stage0, feature(associated_consts))]